| 摘要: |
| 采用先进的温度在线测量手段，在施加胶粘剂的情况下，研究了密度对刨花板热压过程中表层、芯层中心点温度及芯层（中平面）温度分布的影响。结果表明，随着密度的增大，刨花板板坯表层、芯层中心点温度在快速升温段的升温速度减小，但减小的程度不同；板材密度越大，芯层与表层中心点温度到达100 ℃的时间差越大；板材的密度越小，芯层温度分布越均匀；不论板材密度大小，快速升温段在中心点达到汽化温度之前，板坯芯层心部的温度比边部高，但不是中心位置最高，而是邻近中心点位置的温度高；在中心点开始进入汽化段时，边部未进入汽化段，边部的温度还在继续上升并超过中心点，板坯密度越大，汽化段芯层温度差异越大。 |
| 关键词: 刨花板 密度 热压 温度场 |
| DOI： |
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| 基金项目:西北农林科技大学重点科研项目 |
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| The effect of density on the temperature distribution of particleboard during hot-pressing |
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| Abstract: |
| Using an advanced temperature measure method,the effect of density on the central location temperature of surface and central layers and distribution along the mid-plane of particleboard mat with urea formaldehyde is carried out.Results show the temperature-increasing rate of the central location temperature of surface and central layers of particleboard mat decrease coupling with the density increases,but the extents are different.The time gap between central and surface layers central location reaching 100 ℃ is enlarging with the higher density.The mid-plane temperature distribution is more homogenized with low panel density.During the fast increasing stage,compared with the side locations,the temperature of points located in the middle of particleboard is higher,but the highest temperature doesn’t occur in the geometry center of mat;when temperature of center location reaches its evaporation temperature,the side locations temperatures don’t reach its evaporation temperature,and its temperature increases,eventually outweighs the temperature of center location,the higher density of mat makes a big difference about the temperature distribution. |
| Key words: particleboard density hot-pressing temperature distribution |
